Looking for mature people running custom levels

I'd like to get right to the point and say that I really enjoy playing TF2. Kinda hard to find these days - people playing for fun, not just to win with an extreme ego (losing and winning are both meant to be enjoyable). For instance, if the teams are unfair, someone will obviously teamswitch to even it out. I appreciate players like that.

Anything PL/CP, respawn time with a mature gang sounds really great to me.
Probably even get me into level design for this game. I'd really like to somehow.